Weft inserting device



R. DEwAs WEFT INSERTING 'DEVICE Sept. 18, 195i 2 Sheets-Sheet 2 FiledAug. 2v, 1948 INVENTOR Raymond Dewos ATTOFLN Patented Sept. 18, 1951ApplicatiomAugust 27, 1948;?Seria hNoe 46;!5432IncFrance-SeptemheriQr1947 i The invention relatestto weft-insertingdevices.

for continuous-lead! weaving, looms; it concerns;

weft inserters comprising a holding member withv auresilientclampandmore especially the holding member with. a resilient-clamp of f the.v

pulling needles of the type describediand'illfis;

trated in the-applicantsU. SJPatent No.. 2',1l9',57'3" granted .June:7,- ;1938, saidctype .of needles bein providd,,on one. or. oneboth' of.the. arms or branches oi the resilient-clamp, withmeans for. enabling.'the,weftthread which comes from the stationary bobbin andflwhich.nipped by, the" clamp, .to come. into contact .with the outer face ofthe resilient arm,- said means,- in. addition .to. their) notpreventing; the releasing blade from. passing, enable the. thread,'stretched between the bobbin .and' the. point. of nipping, to produceautomatically of its own accord, while it is. unwinding, and.by theactual effect of its tension,

an increase of' pressure; of" the. resilient arm.

against th rigid. arm and. consequentlia. an. in-

crease inthe clamping. force-at; thelpjoint" of nipping, proportionallyto. said.' tension The invention. relates iniparticular to. the case inwhich said meansare. adapted to effect the exchange. of. the thread?b'etween' the conveyingj needle. and. the. pulling. needle .at" themoment" prise, interalia, the.arr'angen'ient', on the edgeof theresilient arm located'opposite the felloffth'e cloth; of'alater'arnotchextendedby' a longitudinalslit; the ,portion cutioutiformin'g an up?tiirn'edf t'ooth directed? towards the. rear ofth'e" clamp. fPractice.has shown that. in .this. type .of'. pull mg needle, the front portionofltheresilihtarni".

isweak and "comparatively; fragile, thereby mak; ing, it able. to.hecome...deformedl' and'tov break.-

Furthermore; the sliding of" the weft thread suppliediby the conveyingneedle is efiected'bv'er the'fupturned' tooth;.. which .causesa'fatigue: of"

thjethreadi .On the. other hand,. it. sometimes" happens; owing? to. afaulty... adjustment. of the clamp, that the freeendfof fthe. threadtends, byfthepulli'r'ig.

forceito place .its'elfi' in alignment'w ith the portion .co'mingiromthe bobbin and is". thus name:

toescape from thehook.

provide additional. iriiprovementsv in the mamh'e'rsin question.

Flor thispurpose. the. invention provides; provementsnin theyconstruction...off the resilient clamp of, the aforesaidltypfi .01.pul1in'g, needle},

and more particularly in..the' .construction" of 'its'ii resilient armorbranch, said. improvements. being;

mainly characterizedb'y thefact" that "the front portion of theresilient arm is provided" with an anglesectionon each offits. sides;the downwardly. directed: .wi'ng. ofi'theangl'. on .tlie".reed"sid1ed'ge extendingwover. a-,comparatively;1 great'ilength; .on'

the one handftoward's'lthe ,rear,',beyondthe zone containingthe..upti1rried; tooth, and; the lateral notch, .and'ion..theothenhand'ltowfldsthe front';; so'-as.to.iform the. tip,.or: noseof,saidi resilient arm, whereas theupwardl'ydirecte'd wing 'of "the" angle.on. the .fell. side .edge is of smallerilngtlr and.- extends from the?froirit endjiof, said edge'ito the tip of the ito'oth;

' According; tor aribtheri 'featureof .the' invention; the. end'ofQ'tlief resilient, arm* extends ibeyon'd" the: end of the. rigid, arm; which;intenali'a; offers the? advantage of enabling the distancebetween" thetip, of the guard and. the point of nipping. ,of the threadtobefdcreased.

Accordin'gto anotherfeature-tottheinvention: the angleon thefellsi'deedgeexterrdsto: the'tip ofthe tooth? therebyjm'aldn'gj saidtoothundeforma'ble and enabling ititdhe'tgiven thefshape' of ahook, thetip"of wliich.isbent towardethe According" toanotherfatnremfthe-invention; the" width of the .front portion" of theresilient-' arm is" decreased; which is? mad'epossioleby theadditionalstrength imparted b'y the angle-- seer-- tions,-- andenablesa: pullingclamp to' be obtained wherein the front portion, a'long whi'ch'the weft"thread"passes'atthe instant when the exchange is taking place, isnarrower. Y

Accordingqto-anotherriatine off'theinvention. at 'abotifitheihei'ghfofo1"in'line"with:.'theb0ttonr of the slit" extending the lateral notch;a? mew is providedon theoutside, which straddles the angle oftheangle'section' on-thefllsid edge, said nick forming, with the face of'ther rigid arm against whichthefrorit portion of the r'ee silient armbears for nipping the thread; a' hind oi: stopqi'otch which*faci'li-tates' the exchange-and fixes the position OFthe fiee-emd oFthethread? According ttr a furthenfeatm'e of the inven tion, thestopmotclrm'a=y;-* be provided onthe rigid arm; or two-stop-notches"mayheprovidedf one on the resilient arn'r and the otheroir therigid arm;-

Owing "to these" improvements? providd' in the" resilient clamp of thepulling needle: itwill" beunderstood, in particular as regards the anglesections, that the one on the reed side is chiefly intended tocompensate for the lack of strength of the resilient arm, and the anglesection on "the fell side fulfils two main purposes: it renders the hookrigid and remarkably facilitates the sliding of the weft thread owing tothe fact that said Weft thread does not have to hoist itself, so tospeak, along said hook, so that the weft thread is still less fatiguedand the safety margin in the longitudinal direction, which is necessaryfor the thread to be caught reliably by the hook, can be reduced to astrict minimum.

It will also be understood that by bringing the tip of the hook closerto the reed, and consequently to the guard, a further protection isobtained, all other things remaining equal, against an untimelypenetration into the hook, of the warp threads which are pushed away bythe guard.

It will further be understood that owing to the decrease of the width ofthe pulling clamp in the front portion thereof through which the weftthread passes, the margin is increased between the pulling clamp and thesurface of the head of the conveying needle.

On the other hand, it should be noted that the elimination of theresilience of the front portion of the resilient arm owing to theprovision of angle sections produces particularly important results, theapplicant having found that the adjustment of the clamp is facilitatedthereby and the life of the releasing blade is prolonged to aconsiderable extent, whereby many advantages are procured.

In order to enable the invention to be clearly understood, an embodimentof a pulling clamp of the type specified, involving the application ofsaid improvements, is described hereinafter and diagrammaticallyillustrated, by way of a nonlimitative example, in the accompanyingdrawings in which:

Fig. 1 is an elevational view of the improved resilient arm on the sidefacing the fell;

Fig. 2 is a top plan view thereof;

Fig. 3 is a perspective view, showing separately, before they areassembled, the rigid arm and the resilient arm, and also the guard;

Fig. 4 is a perspective view, showingthe rigid and resilient armsassembled to one another, forming the improved resilient clamp, and alsothe guard, the assembly being shown mounted at the end of the arm ofapulling needle;

Fig. 5 is a view in transverse section along the plane VV of Fig. 4;

Fig. 6 is a view'in transverse section along the plane VI-VI of Fig. 4;

Fig. 7 is a plan view, on a larger scale, of the front end of theresilient clamp, showing the position of the thread during the pullingoperation;

Fig. 8 is a similar view to Fig. 7, relating to a modification, and

Fig. 9 is a view in section along the line IX-IX of Fig. 8.

According to these figures, I is the resilient arm or branch, 2 therigid arm, 3 the guard, 4 the arm or stock of the pulling needle, madeof moulded plastic material for example, and the end of which issuitably shaped to enable the rear ends of the rigid arm 2 and of theguard 3 to be mounted and fixed thereon; 4 is the groove providedlaterally over the greater part of the length of thestock 4 in order toform a passage for the releasing blade, not shown, which 4 is mounted ona support located outside the shed, near the selvedge, said blade beingintended, when the pulling needle is coming out of the shed, to separatethe two arms I and 2 of the clamp and thereby release the end of theweft thread which is nipped between them.

The resilient arm I is fixed at its rear part I, by means of screws orotherwise, in the rear part 2 of the rigid arm 2, and is adapted to bearresiliently, by means of its front portion I, against the front end 2 ofthe rigid arm 2 so as to nip the weft thread.

As already stated, the improvements provided in the resilient arm relateparticularly to the front portion I thereof.

They are characterised in that said portion I forms, opposite the reed,a right angle, the wing I of which is directed downwards. Said wing isextended and forms the tip with an inclined ramp I which extends beyondthe end of the rigid arm 2. The portion of weft thread, stretchedbetween the resilient clamp of the conveying needle and the support ofsame, slides over said ramp, straddles the upper surface of theresilient arm up to the tooth I when the two needles meet one another.

Opposite the fell, the portion I of the resilient arm forms a rightangle, the wing I of which is directed upwards and extends from thetapered end I to the tip I of the tooth-shaped cut out portion I thatbounds the longitudinal slit I extending the lateral notch I The slope Ion the reed side edge I thereof, is of increased length, which reducesits slope and enables the thread coming from the bobbin, once it hasbeen caught by the hook I to pass readily over the end I and assume itsself-tensioning position.

The end of the angle section I forms the hook I which extends above theslit I Finally, at the height of or level with the bottom of said slit Iis provided a nick I that straddles the outer angle of the resilient armI opposite the fell. Said nick (Fig. 6) extends over a portion of theheight of the outer face of said resilient arm and also over a portionof its inner face in contact with the upper face of the portion 2 of therigid arm. The weft thread 5 is stretched, while it is being pulled,between the feed bobbin and the point of nipping passing through thebottom of the slit I where it forms a bend; the movement of its free end5 by sliding owing to the pull, and consequently the straightening outthereof in alignment with the portion coming from the bobbin, whichmight cause the thread to escape from the hook, are prevented by itsengagement in the nick I which forms a stop-notch.

In the modification shown in Figs. Band 9, the resilient arm I isprovided on its upper face with a boss I which is provided with anapproach ramp I extending alongside the slit l Said boss then passesround the bottom of said slit and merges obliquely into the wing I ofthe angle section which it encounters at I Owing to this arrangement,the thread 5 caught by the hook" I mounts the boss by means of the rampI the oblique shape of said boss constraining thev thread to continue tomove up to .Iiwhereby as soon as it is stretched between the clamp andside facing the fell.

outer face of the resilient arm in a zone which is closer to the fellside edge and therefore at on the reed side is decreasedinwidth ftherebyI theepolnt where theiseiietensiomng emreeisefi tneihottemr ithez rm ndsin'inaonne i e the greatest eflicacyi efiurthernappreeiahlit nteet on 9!3 3 1 Pa Qf:-.,. h.e tee h... a crease;iior;a given. tensioning'foree-oftheolamp th'hQl-Il bent. .towen tile-item thez safe'guard against. anuntimely slippingmofi o rl e-nettethethreadiinstheclemp.- v 5 -leit if;;d Vi r 1 .9 2

-:l2he .boss; may. originate; C1OSeI..l70.:.l7heJhOQki weavinlooms-havin a r i I. In this case, it may overhang the bottom th v ;i ofthe-slit. Ia 'so..tha.t..-the point I may be cated approximately at theheight of the bottom of said slit i 1 g as -regards the rigid-arm 2,,its f-r-rmtportion onti nuges;

I it dweavinaloem: ar eider :p

involving t eli in tion o the nn l section eenl ee mnrris nge ninnnermembeena 1 2 (Fig. 3) over a certain'length so as to leave resilient.arm -having. a tooth, and a. ico ac n room-for the angle sectionw-l ofthe resilient. lateral ,notch, an arm L. Said frontportion ofthe rigid-arm z the notoh on may be provided with a recess 2 formed for cloth,and further having an angular section on example in the manner shown inFig. 9, for the side opposite the rigid arm and a substanfavouring theremoval of the impurities pushed tially narrow portion through which theweft back by the releasing blade. my thread passes at the instant ofexchange.

As regards the guard 3, the same is reinforced 5. In a weft insertingdevice for continuous by right angle flanges 3 and is at the same timefeed weaving loom having a pulling needle comlightened by holes 3prising a m'pping member having a resilient arm,

It is of course to be understood that, without the arm having a toothand a coacting lateral exceeding the spirit of the invention, it is pos-5 notch and a longitudinal slit extending the sible to makeimprovements, modifications and. notch on the edge facing the fell ofthe cloth, additions, and also to consider the use of equivathe armfurther having a second notch on said lent means. edge aligned with thebottom of the lateral notch For example, as hereinbefore stated, thestop and adap ed t prevent the thread from escapin notch I may beprovided on the rigid arm 2, so from the tooth. as shown at 2 (Fig. 3),or the clamp may be 6. In a weft inserting device for continuousprovided with two stop notches such as I and 2 feed weaving loom havinga pulling needle comrespectively. prising a nipping member having aresilient arm,

Likewise, the boss I after it has passed round Said arm having a tooth ne en c in lateral the bottom of the slit may encounter the angle netehand a longitudinal Slit extending t e notch section I for example atright angle, while on the edge facing the fell f the 1 t a rigidgradually decreasing in thickness, so that the arm against Which thefront po of t e rethread 5 caught in the hook and having mounted,silient r b r the rigid m h vi g a n t h by means of the ramp the bossIn, extends on said edge aligned with the bottom of the londownwardsagain in the direction Of the angle gitudinel Slit O e resilient m WhenS cu ed section I so that in this case again, as soon as thereto andadapted to form with the resilient it is stretched between the clamp andthe bobbin, arm a stop notch. it is shifted sideways towards the fellside edge. In a Weft inserting device for on inuous In this case, theboss may also overhang the e Weaving 100m having a pulling e d e00mbottom of the slit I prising a nipping member having a resilient arm,

Such arrangements of the boss, or any other Said am having a tooth and ameeting lateral sijnflar arrangements tending to produce the notch and alongitudinal Slit extending the notch sam result, may of course beapplied by way of on the edge facing the fell Of the 010th, theresiliimprovements to the boss I3 of the resilient arm ent arm furtherhaving a Second notch on said 5 of the resilient clamp 0f the pullingneedle dee aligned with the bottom of the longitudinal scribed in theapplicants aforesaid patent. it; a rigid arm against which the front ofthe 1 1 m; resilient arm bears and adapted to nip the thread,

1. In a weft-inserting device for a continuous the rigid arm having anotch on a e e and feed weaving loom having a front, a pullingneeadapted to coact with the second notch of the dle comprising anipping member having a re- 55 s e t arm When Secured thereto. silientarm, the arm having a tooth on the edge 8. In a weft inserting devicefor a continuous facing the fell of the cloth and an angular secfeedweaving loom having a front and reed sides; tion on the front portionintermediate the tooth a pulling needle comprising a nipping member andthe bottom of the arm, the downwardly dihaving a resilient arm with anangular section; rected wing of the angular section extendin to a rigidarm against which the front portion of from the apex thereof to thebottom, the upthe resilient arm rests, the edges of the front wardlydirected wing of the angular section exportion of the rigid arm on thereed side being tending from the apex thereof to the tip of recessed,whereby said front portion is narrower the tooth and relatively shorterthan the downthan the rear portion of the rigid arm. wardly directedwing. 9. In a weft inserting device for continuous 2. In a weftinserting device for continuous feed weaving loom having reed sides; apulling feed weaving loom having a front and reeds, a needle comprisinga nipping member having a pulling needle comprising a nipping memberhavresilient arm; a rigid arm, means securing the ing a resilient arm,the arm having a tooth and resilient arm to the rigid arm and adapted toa coacting lateral notch and a longitudinal slit (0 provide a nippingmember for the weft thread, extending the notch on the edge facing thefell the opposed face of the rigid arm being provided of the cloth, thearm further having an angular with a recess on the reed side. section onthe front portion on said edge inter- 10. In a weft inserting device forcontinuous mediate the tooth and the bottom of the arm feed weaving loomhaving reed side edges, a. and extending in one direction downwardly topulling needle comprising anipping member hav- 7 ing a resilient arm,the arm having a tooth and a coacting lateral notch and a longitudinalslit extending the notch on the edge facing the tell of the cloth, thefront portionof the resilient arm between the bottom of theslit and thebottom of the arm sloping toward the reed side edge. 11. In a weftinserting device for continuous feed weaving loom having a pullingneedle comprising a nipping member having a resilient arm, the armhaving a tooth and a coacting lateral notch and a longitudinal slitextending the notch on the edge facing the fell of the cloth, the armfurther having on the upper face thereof an angular section intermediatethe tooth and the bottom of the arm and a boss, a ramp -for the boss,the ramp and boss extending alongside the longitudinal slit and thebottom thereof to merge obliquely with the angular section.

12. In a weft inserting device for continuous feed weaving loomaccording to claim 11 in which the boss is characterized by graduallydecreasing in thickness toward the edge facing the tell of the cloth.

4 RAYMOND DEWAS.

REFERENCES CITED Name Date Number Dewas Nov. 3, 1936'

